GB2308931B - Automatic frequency control circuit for digital radio communication system - Google Patents
Automatic frequency control circuit for digital radio communication systemInfo
- Publication number
- GB2308931B GB2308931B GB9627025A GB9627025A GB2308931B GB 2308931 B GB2308931 B GB 2308931B GB 9627025 A GB9627025 A GB 9627025A GB 9627025 A GB9627025 A GB 9627025A GB 2308931 B GB2308931 B GB 2308931B
- Authority
- GB
- United Kingdom
- Prior art keywords
- control circuit
- communication system
- radio communication
- frequency control
- digital radio
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
- H03D7/16—Multiple-frequency-changing
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
- H03J7/02—Automatic frequency control
- H03J7/04—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant
- H03J7/045—Modification of automatic frequency control sensitivity or linearising automatic frequency control operation; Modification of the working range
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
- H03D7/16—Multiple-frequency-changing
- H03D7/161—Multiple-frequency-changing all the frequency changers being connected in cascade
- H03D7/163—Multiple-frequency-changing all the frequency changers being connected in cascade the local oscillations of at least two of the frequency changers being derived from a single oscillator
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
- H03J7/02—Automatic frequency control
- H03J7/04—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/403—Circuits using the same oscillator for generating both the transmitter frequency and the receiver local oscillator frequency
- H04B1/405—Circuits using the same oscillator for generating both the transmitter frequency and the receiver local oscillator frequency with multiple discrete channels
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Superheterodyne Receivers (AREA)
- Transmitters (AREA)
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1019950067805A KR0164381B1 (ko) | 1995-12-30 | 1995-12-30 | 디지탈 무선 통신시스템의 자동 주파수 조절회로 |
Publications (3)
Publication Number | Publication Date |
---|---|
GB9627025D0 GB9627025D0 (en) | 1997-02-19 |
GB2308931A GB2308931A (en) | 1997-07-09 |
GB2308931B true GB2308931B (en) | 1997-12-17 |
Family
ID=19447897
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB9627025A Expired - Fee Related GB2308931B (en) | 1995-12-30 | 1996-12-30 | Automatic frequency control circuit for digital radio communication system |
Country Status (4)
Country | Link |
---|---|
US (1) | US5903600A (ko) |
KR (1) | KR0164381B1 (ko) |
CN (1) | CN1078982C (ko) |
GB (1) | GB2308931B (ko) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5963851A (en) * | 1997-04-07 | 1999-10-05 | Motorola, Inc. | Automatic frequency control system using multiple threshold levels and method of using same |
US5933059A (en) * | 1997-10-22 | 1999-08-03 | Ericsson Inc. | Method and apparatus for controlling frequency synchronization in a radio telephone |
JP3397238B2 (ja) * | 1998-10-01 | 2003-04-14 | 日本電気株式会社 | 移動局および移動局におけるafc制御方法 |
US6229991B1 (en) * | 1998-10-13 | 2001-05-08 | Motorola, Inc. | Method of and apparatus for automatic frequency control range extension |
US6466803B1 (en) * | 1999-10-19 | 2002-10-15 | Qualcomm, Incorporated | Multi-mode communications system with efficient oscillator synchronization |
GB0000944D0 (en) * | 2000-01-14 | 2000-03-08 | Simoco Int Ltd | Radio receivers |
KR100423059B1 (ko) * | 2001-12-27 | 2004-03-12 | 엘지이노텍 주식회사 | 광대역 수신기의 afc 장치 및 방법 |
US20060148421A1 (en) * | 2005-01-04 | 2006-07-06 | Via Technologies, Inc. | Method and apparatus for frequency adjustment |
CN100384095C (zh) * | 2005-04-18 | 2008-04-23 | 威盛电子股份有限公司 | 频率校正的方法及装置 |
CN102752010B (zh) * | 2011-04-21 | 2016-06-15 | 沈阳中科微电子有限公司 | 一种用于通信基站的收发模块 |
CN105227195B (zh) * | 2014-05-30 | 2018-03-30 | 展讯通信(上海)有限公司 | 一种自动频率校准系统及校准方法以及移动终端 |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0678974A2 (en) * | 1994-04-21 | 1995-10-25 | Nokia Mobile Phones Ltd. | A transmitter and/or receiver |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4852086A (en) * | 1986-10-31 | 1989-07-25 | Motorola, Inc. | SSB communication system with FM data capability |
US5042082A (en) * | 1989-06-26 | 1991-08-20 | Telefonaktiebolaget L. M. Ericsson | Mobile assisted handoff |
FI91821C (fi) * | 1991-02-22 | 1994-08-10 | Nokia Mobile Phones Ltd | Radiopuhelimen automaattinen taajuudensäätökytkentä |
EP0500373B1 (en) * | 1991-02-22 | 1998-04-29 | Sony Corporation | Time division duplex transmitter-receiver |
-
1995
- 1995-12-30 KR KR1019950067805A patent/KR0164381B1/ko not_active IP Right Cessation
-
1996
- 1996-12-30 US US08/777,761 patent/US5903600A/en not_active Expired - Lifetime
- 1996-12-30 GB GB9627025A patent/GB2308931B/en not_active Expired - Fee Related
- 1996-12-30 CN CN96121388A patent/CN1078982C/zh not_active Expired - Fee Related
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0678974A2 (en) * | 1994-04-21 | 1995-10-25 | Nokia Mobile Phones Ltd. | A transmitter and/or receiver |
Also Published As
Publication number | Publication date |
---|---|
US5903600A (en) | 1999-05-11 |
CN1166728A (zh) | 1997-12-03 |
KR970055871A (ko) | 1997-07-31 |
CN1078982C (zh) | 2002-02-06 |
GB9627025D0 (en) | 1997-02-19 |
GB2308931A (en) | 1997-07-09 |
KR0164381B1 (ko) | 1999-02-01 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20081230 |